Enrico feroiibi



E. FEROLDI.

CARBURETER. APPLICATION FILED NOV. 3. 1911.

1,322,554 Patented Nov. 25, 1919.

Enrico Fro ldl fm enfw ENRICO FEROLDI, OF TURIN, ITALY.

CARBURETER Specification of Letters latent.

Patented Nov. 25, 1919.

Application filed November 3, 1917. Serial No. 200,022.

constituents (fuel and air) in accordance with the running speed of the engine and atmospherical and barometrical conditions; said arrangement comprises a device opening a suitable air inlet when the member controlling the supply of mixture to the engine is fully opened so that the richness of the mixture may be reduced the supply of air being suitably increased.

Such an arrangement may be constructed in various manners according to the type of the carbureter to which it is to be applied and is preferably operated by' the member controlling the mixture supply to the engine, this allowing of making as simple as possible its operation which may be efi'ected by same at 90 -10 may reach the same member controlling the valve of the carburetor.

The annexed drawing shows by way of example some constructions of said device and Figure 1 shows diagrammatically a construction of the same as applied to a. butterfly valve carbureter; Fig. 2 shows in section another construction for carbureters of the same tipe; Fig. 3 is the outer view of the with regard to the section shown in Fig. 2.

In the construction shown in Fig. 1, a portion of the wall of the chamber 1, into which the fuel supplied by nozzle 2 is atomized, is shaped to form the seat 1 for a valve 3 the stem 4 of which is mounted so as to reciprocate in a hole of the seat and extends into the chamber 1. The valve seat is pierced by holes 5 and is provided with a cap 6 having holes 7 and carrying a spring 8 intended to push the valve head in its closed position. An adjusting screw 9 mounted in the central portion of cap 6 allows of regulating the stroke of the valve.

The position of the valve seat on the chamber 1 and the length of stem 4 must be properly selected so that the butterfly alve the end of the stem and push from its seat just when butthe valve away opened terfly valve has reached its fully when the disk 3 position and is passing beyond the same, as shown in dotted lines.

Obviously with the above described arrangement. the carbureter operates in the ordinary manner so long as the butterfly valve 10 is in an intermediate or in its fully opened position, that is in the position in which it is placed along the axis of chamber 1; on the contrary on further operating the controlling lever in the direction required for opening said valve just as this latter is passing beyond its fully opened position the valve impinges the end of stem 4 and pushes the valve 3 away from its seat so as to give pazsage to atmospheric air-through holes 5 an 7.

The mixture produced in the chamber 1 is thus added with air flowing into the chamber owing to the suction exerted by the engine, the depression being thus reduced in the same chamber and consequently the supply of fuel fed by the nozzle 2 being also 'reduced.

The-same result may be obtained by the construction shown in Figs. 2 and 3 in which a seat 1 having holes 5 is provided at the point of wall of chamber 1 in which is journaled one of the pivots of the valve 10; on

an extension 11 of said pivot is secured a disk 3 pushed against the seat by a spring 8 and having at its periphery two transverse pivoted rollers 12 each of which is intended to engage a wedge projection 13 provided on the outer wall of chamber 1 and valve 10 reach the required position. Said rollers 12 come into engagement with projections 13 as soon as the valve 10 is passing beyond its fully opened position so that by further rotating said valve by means of the controlling lever 10, the disk 3 is removed from its seat owing to the engagement of rollers 12 with the wedge projections 13 and uncovers holes 5 through which air flows into chamber 1.

\Vhat I claim as my invention and desire to secure by United States Letters Patent 1. In a carbureter for explosion engines, a carbureting chamber, a throttle valve controlling the communication of said chamber with the engine suction duct formed with auxiliary air openings therein, a valve independent of the throttle valve and maintained by a spring in position to close said openings, and means on said valve adapted to lift the same, said means cooperating with the throttle valve only when said throttle valve reaches its fully open position.

2. In a carbureter for explosion engines, a *carbureting chamber, a butterfly valve controlling the communication of said chamber with the suction duct of the engine, an auxiliary air valve independent of the said butterfly valve, a pin projecting from said auxiliary air valve and arranged in the path of said butterfly valve which cooperates with 10 said pin only when said butterfly valve reaches its fully open position.

Signed" at Turin, Italy,' this 15 .day of October, A. D. 1917.

ENRICO FEROLDI. Witnesses:

MARIO DEPONPO, GIUSEPPE DI LU. 

